president obama has put house speaker john boehner and republicans in a box on fiscal cliff negotiations. and the evidence is mounting. president obama stayed on offense today, visiting the santana family in northern virginia whose taxes will go up more than $4,000 in 2013 if middle class tax cuts aren't extended. >> i'm encouraged to see that there's been some discussion on the part of republicans acknowledging the need for additional revenue. as i've indicated, the only way to get the kind of revenue for a balanced deficit reduction plan is to make sure that we're also modestly increasing rates for people who can afford it. folks like me. just to be clear, i'm not going to sign any package that somehow prevents the top rate from going up for folks at the top 2%. >> the concerted effort from the white house is very clear. here's white house press secretary jay carney. >> what will produce a deal is an acknowledgement by republicans, republican leaders, that rates on the top 2%, the wealthiest americans, have to rise. there is no deal without that acknowledgement, and without a concrete,